(2) region (2 ). native Weta This arca included both the task force cam at populated atoll of Ujelang, It was considered first ortority due to the fact that the dewelopmont of potentiajly hasardous conditions off-site weuld, from the viewpoint of fall-out rate and time of arrival, be first detectable in this general area. Consequently, it was planned that the tracking sfforts ahould first be devoted to s patrol to the wost of GZ_ in such a way that the task force camp at Eniwetok and Ujclang toll would be placed in tho "shadow" of the search aircreft. This was accazp= lished by sctting wp a racetrack holding pattern to patrol generally north and south across a sector limited by boarings from GZ to Eniwetck and Ujelang, with sufficient additional spread on the sector to assure complote coverage of any contaminated air likely to drift to thcse two locations (Flight #1. See Inch 2), Since conditions developing during the first hour or two after shot tins wero assumed insufficiontly stable to warrant @ dotailod analysis ani too closewin for rvasonable safet7 of the aircraft crow, Plight #1 was designated to begin its patrol at about H plus 2 hours and 50 milos west of GZ. Ten thousand feet was tho altitude selected as the most reasonable compromise for the data desired. It was aseumed that a patrol of about 3 hours should bo suffieicnt to obtain tho answers ncoeded, however, tho plan provided for a longer period of patrol if specific shot circumstances required such 8 modification, On several shots this action was necessary, (2) . Tads was the region froa which seco: cecur on task force shote atoll camp sito and fleots Since fall-out from this rogion would arise fram the settling of contamination inte the trade winds from higher lovels (which had transported debris to the cast), @ consideration of fail rata and time of arrival dictated patrol of this region latcr than 3 (1) above but within about 6 to 12 hours posteshot, an "E" type search pattern at 10,000 fect was specificd for the aircraft described in 36 (3) above, to be flown following the racetrack holding mission (Flight /1). Grant » arca was of ¢ above, but considered of less urgency om shot day duc to its more favorable location with rospect to GZ and duc to the greatcr distances from GZ and tho longor period of time roquired for dctcctablc . Contamination to reach goographical positions potentially hazardous to those atolls, 4n "E" type search pattorn was designated to be flown at 10,000 feet (Flight #2. See Incl 3).. (6) LALBEELE> - Thoee areas were ¢ of the Marsh I. least priority duc to scparato action taken to close and swecp the forecast questioabls sectors and routes. The last half of Flight was scleeted for this requirement to be flown at 10,000 fect ami through the rogion north of G2 doterminod to be representative from the forecast air radex and the air particls trajectorics. ($) Two additional afroraft (Flights #3 and #4) were planne to scarch from H plus 24 to H plus 36 hours and fram H plus 36 to 4 pius e-3 | J